PaintSquare.com


The First Word in Protective & Marine Coatings

A Product of Technology Publishing / PaintSquare
JPCL | PaintSquare News | Durability + Design | Paint BidTracker

Marine Industry Coating Systems: Selecting and Sourcing

Problem Solving Forum

| More

January 30 - February 5, 2012

When the relative humidity in a paint shop exceeds 80%, how can you apply waterborne inorganic zinc so that it cures sufficiently for topcoating in a reasonable time?



More items for Coating Application


Selected Answers

From jesse chasteen of schriener construction on February 3, 2012:
If this is a continous obstacle, they make an incredible piece of equipment: dehumidifier. Cranking the heat up does not always displace air moisture. Two light coats can bite you back, as is stated by M/M. It doesn't like going over itself.

From Vyacheslav Volosiuk of Polymerprotection Ltd. on April 3, 2012:
     Dehumidification, heating and application wet on wet  all go well. The dried film is porous, and if thick enough will readily absorb the binder from the second coat, so let it dry to the point when it only begins to change color to light gray. If dried completely, some addition of binder will help not to obtain a powdery film over the second coat. There are different WB IOZ formulations. Some really do not adhere to themselves and delaminate like scale, either immediately or later in service. Some don't cure at low temp and high RH, leaving irreversibly powdery film down to substrate and must be re-blasted and re-applied. If not thixotropic enough, one full wet coat will sag from vertical surfaces and may leave a crust on horizontal surface which will cure and remain water-sensitive for a very long time, so at least two passes is a must. So be careful and first make sure what material you are dealing with.

From David Zuskin of SAIC/US NAVAL RESERACH LAB on February 10, 2012:
Don't mess with WBIOZ when you can't control the relative humidity and the dew point. If you are close and spray, you add additional moisture to the atmosphere as you apply.....ask me how I know.

From Earl Ramlow of Polyset on February 7, 2012:
    If you were using a high-ratio, waterborne inorganic zinc, RH at 85% would not be an issue. It will cure within minutes, and adheres great to itself, if two or more coats are required for millage.

From Matt McDonald of Carboline on February 10, 2012:
To follow up on my post and the other comments, the high-ratio silicate formula is the most user-friendly and best performing WBIOZ. All of the things discussed (heat the steel, DH, air movement) will help drying in humid conditions. The high-ratio zinc silicate can recoat itself in the initial drying stage. It has to be applied as the first coat is "setting up," almost wet on wet. This would typically be done if the WBIOZ is to be used as a single coat (5 mils dft) . WBIOZ does not recoat itself well after it is completely dry or cured.

From Khalid Shaikh of Munters Pty Limited Australia on February 7, 2012:
     Use a dehumidification unit to control humidity and dew point.

From Matt McDonald of Carboline on February 3, 2012:
Be careful with 2 coats. WBIOZ is meant to be applied to steel and does not adhere well to itself. Heat the steel, and that will drive the water out of the film.

From Josh Inklovich of Total Coating Solutions on February 8, 2012:
     Having worked in a large, industrial painting facility, I can tell you that when the humidity was too high, we broke out the fans and the heat, even in the summer. It seemed to do the trick.

From bryan buckley of corcon inc. on February 2, 2012:
     Apply 2 coats at half the required film thickness. Or maybe just turn the heat up in the shop!

Please sign in to submit your answer this question    

Tagged categories: Curing; Ease of topcoating; Humidity and moisture; Waterborne coatings; Zinc-rich (inorganic)


Current PSF Question | Submit a PSF Question | Full PSF Archive

Midsun Specialty Products
Stopaq Corrosion Protection Services by MSP

Stopaq coatings are impenetrable to water, oxygen and bacteria. Save labor costs with simple surface prep and a 30 year guarantee.
Visit: midsunsp.com/stopaq or Call 888-866-8273


Clemco Industries Corp.
Powerful Protection in a Small Package

Mounts inside blast helmet, alerts operator to dangerous breathing-air condition by audible, visual, and vibratory alarms. Easily calibrated, battery operated.


BASF
New resins from BASF will have metals loving water:

Excellent corrosion resistance, low VOC, high gloss, thin films basf.us/industrialcoatings
polyorders@basf.com
800-231-7868


Harsco
BLACK BEAUTY® App

Download the free app for BLACK BEAUTY® Abrasives. Explore all the features from the palm of your hand.
Toll Free: 1-888-733-3646


Mitsubishi Gas Chemical America
Performance Amine 1,3-BAC

A highly reactive cycloaliphatic diamine offering superior performance. Reasonable cost and curing efficacy makes it suitable for all types of epoxy resin applications.


International Paint LLC

International Paint Engineered Coatings

Learn about our solutions for:
  • Structural Steel
  • Piping & Equipment
  • Storage Tanks
  • Pressure Vessels
  • Secondary Containment


    PreTox Products - NexTec, Inc.
    GOT LEAD? Specify Pretox System products

    The ONLY Lead Stabilizer Compatible with All Paint Removal Methods. Works with all Blast Media: Grits | Recyclable Abrasives | CO2 | Water | Power Tools | Etc. Call Dave Steffen at 800.338.8296.

  •  
     
     
    Technology Publishing

    The Technology Publishing Network

    The Journal of Protective Coatings & Linings (JPCL) PaintSquare
    Durability + Design Paint BidTracker JPCL Europe

     
    EXPLORE:      JPCL   |   PaintSquare News   |   Interact   |   Buying Guides   |   Webinars   |   Resources   |   Classifieds
    REGISTER AND SUBSCRIBE:      Free PaintSquare Registration   |   Subscribe to JPCL   |   Subscribe to PaintSquare News
    MORE:      About PaintSquare.com   |   Privacy policy   |   Terms & conditions   |   Site Map   |   Search   |   Contact Us
     

    © Copyright 2000-2014, Technology Publishing / PaintSquare, All rights reserved
    2100 Wharton Street, Suite 310, Pittsburgh PA 15203-1951; Tel 1-412-431-8300; Fax 1-412-431-5428; E-mail webmaster@paintsquare.com